Rheostat



RHEQSTAT Filed March 5, 1922 2 Sheets-Sheet 1 2 I'll/EN 70R J/arrz'sI/asner 2 A TTUH/VEV Agaril 6 19.2

M. KLOSNE'R RHEOSTAT Filed March 5 1922 2 Sheefs-Sheeu 2 INVENTOR ATTORNEY .1. Patented Apr. 6, 1926.

UNITED STATES PATENT OFFICE.

MORRIS KLOSNEB, 01 NEW YORK, N. Y.

nnnosrar.

Application filed March 3, 1922. Serial 1T0. 540,783.

To all whom it may concern:

Be it known that I, MORRIS KLOSNER, a citizen of the United States, and resident of New York city, in the county of New York and State of New York, have invented cer-' tain new and useful Improvements in Rheostats, of which the following is a specifica tion.

This invention relates to electric rheostats, and has for, its object the provision of a device of this character which is adapted for accurate and fine adjustment of current in a circuit.

In carrying out my invention I employ a single turn resistance element in conjunction with a main resistance element of the character generally employed in rheostat cone struction, said elements mounted on a common base, separate contact members for en gaging said elements, and means for alternately operatin said contact members in unison and in ependently, as hereinafter.

fully described and specifically set forth in the appended claims. a

In the accompanying drawings formlng part of this specification, Figure 1 is a face view of my improvedrheostat;

Fig. 2 is a sectional elevation taken on the line 2-2 of Fig. 1;

Fig. 3 is a cross section taken on the l ne Fig. 4 is a rear elevational view of the rheostat; and

Fig. 5 is a diagrammatic view illustrating the rheostat in an electrical circuit. a

In the drawings, 1 indicates a circular base composed of ada table insulating material, said base being xed to a switch-board or other panel 2, by means of bolts 3.

Rotatively mounted through a central bore of the base 1, is a tubular shaft 4, having a reciprocative and rotative solid shaft 5 extended therethrough; said tubular shaft being held against sliding movement, in relation to the base 1, b means of screwthreaded washers, 6 and which are threaded peripherally on the shaft 4, as clearly I shown in Fig. 2 of the drawings. Fixed to the forward end of the shaft 5 is a knob or handle 5 adapted for use in the manual operation of'the rheostat. The end of the tubular shaft 4, adjacent to the knob 5*, is provided with radial serrations 8, which are adapted for interlocking engagement with a pin 9 extended diametrically through and fixed to the shaft 5.

Mounted within a segmental recess of the base 1 is a resistance element 10, which is member 14 provided with a V-shaped bend 15, which engages an annular V-shaped groove 16 of the base 1, and an oblique extension 17, which contacts with a single-tum resistance element 18.

Fixed'to the face of the panel 2 is a disc 19 having" a calibrated scale 20,; and a pointer 21 is fixed-to the tubular shaft 4 for registration withsaid scale. a I

Projecting from the base 1 are two stops 22, 23 for limiting the swinging movement of the'switch arms 11 and 13, said stops being covered with suitable insulating material;

also mounted on the base 1 are two bindingposts 24,25.

' One terminal of the resistance element 18,

' is'electricallyconnected with the shaft 5, by

means of a wire conductor 26 having a flexible coil-extension 27 which is fixed to a 0st 28-, of said shaft 5, and the other terminal ofthe resistance element 18 is in electrical connection with the binding-post 25, by "means of aconductor 29; and the bindingpost 24'is connected to one terminal of the resistance element 10, by means-of a conductor 30. The rheostat is adapted to be connected to .an external circuit by means of conductors 31, 32..

the knob 5 together with the shaft 5 are moved, in the direction of the arrow (1, Fig. 2 of the drawing, sufliciently to cause interlocking engagement of the pin 9 with the In the operation and use of the rheostat serrated end of the tubular shaft 4, this movement throws the contact member 17 of the contact arm 13 back out of electrical connection and contact with the resistance element; 18 whereupon the two shafts may be rotated in unison and the contact member 11 may be swung on the rheostat 10 for mak ing an approximately required, or rough-adjustment, then'by pulling the knob back to its initial position, as shown in Fig. 2 of the drawings, the shaft 5 may be independently rotated for the fine adjustment.

I do not desire to limit myself to the specific structural and mechanical details as hel'ein shown and described, as under the spirit of my invention, I believe that I am entitled to employ such structural variations as may fall within the scope of the appended claims,

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is: i

.1. In a rheostat, a helically wound re sistance element, a single turn resistance element and a contact member in permanent contact with the wound resistance element and a tubular shaft connecting said contact member, a contact member in detachable engagement with the single turn resistance element, a reciprocative shaft extended through said tubular shaftand secured to said last named contact member, and means for rotating said shafts either in unison or independently.

2. In a rheostat, a rough adjustment resistance element and a fine adjustment resistance element, a contact member for said rough adjustment resistance element, and a contact member for said fine adjustment resistance element, means including a single control knob for moving both of said contact members continuously in either direction, and means associated therewith for moving said fine adjustment contact member continuously in either direction by said purpose of effecting a very control knob independently of said rough adjustment contact member.

3. In a rheostat, a rough adjustment resistance element and a fine adjustment resistance element, a contact member for said rou h adjustment resistance element, and a con act member for said fine adjustment resistance element, means including a single control knob for simultaneously moving both of said contact members continuously in either direction, and means associated therewith for moving one of said contact members continuously in either direction indepIendently of the other.

4. n a rheostat, a rough adjustment resistance element and a fine adjustment re-- sistance element, a contact member for said rough adjustment resistance element, and a contact member for said fine adjustment resistance element, means including a single control knob for moving both of said contact members continuously in either direction, and means associated therewith for moving one of said contact members continuously in either direction either in unison with'the other contact member or independently of it.

.. .5. In a rheostat, a base, a rough adjustment resistance element supported thereby onone face thereof, a fine adjustment resistance clement supported by said base on the peripheral surface thereof, individual contact fingers for each of said elements and adapted to move over the same from end to end, and means for manually effecting the movements of said contact fingers.

6. In a rheostat, a substantially circular base provided with a groove in the peripheral surface thereof, a helically wound resistance element supported by one face of said base, and a single wire positioned in said groove in the peripheral surface of said base, individual contact fingers for said element and wire, and means for moving said contact fingers.

7. In a rheostat, a substantially circular base provided with a groove in the peripheral surface thereof, a helically wound resistance element supported by one face of said base, and a single wire positioned in said groove in the peripheral surface of said base, individual contact fingers for said element and wire, and a single control knob for moving both of sald contact fingers.

8. In a rheostat, a substantially base provided with a groove in the peripheral surface thereof, a helically wound resistance element supported by one face of said base, and a single wire positioned in said groove in the peripheral surface of said base, individual contact fingers for said element and wire, a single control knob for moving both of said contact fingers, and means for moving one of said fingers either in unison with the other or independently of it by the operation of said control knob.

9. In a rheostat, a substantially circular base, a rough adjustment resistance element supported by said base on one face thereof, a fine adjustment resistance wire extending substantially around and positioned on the peripheral surface of said base contact fingers for said element and wire, and means for moving said contact fingers.

10. In a rheostat, a substantially circular base, a helically wound resistance supported by one face thereof, a fine adjustment resistance wire Wound substantially around and positioned on the peripheral surface of said base, a contact finger for said resistance, and a contact arm provided with a substantially right angle extension, for con-- tacting with said wire, and means for controlling the movements of said finger and arm.

11. In a rheostat, cular base, ported by one face thereof, a fine adjustment resistance wire wound substantiallv around the peripheral surface of said base. a contact finger for said resistance, and a contact arm provided with a substantially a substantially cir- .right angle extension for contacting with said wire, a control knob, and means for a helically wound resistance supcontrolling both'of said finger and arm by operation of said control knob.

12. In a rheostat, a substantially Circular base, a helically Wound resistance supported by one-face thereof, a line adjustment resistance wire Wound substantially around the peripheral surface of said base, a contact finger for said resistance, and a contact arm provided with a substantially right angle extension for contacting With said wire, a control knob, and means for controlling both of said finger and arm by operation of said control knob to move the same in unison or said arm independently.

13. In a control device for niicrometric adjustments of a rheostat or the like, a base, two concentric resistance wires fixed to said base, two centrally interposed rotatable spindles borne in said base, each carrying a contact finger cooperating with one resistance Wire and a common grasp secured to one of said spindles, rotatable with it, and deplaceable longitudinally of the other of said spindles, said grasp being capable in one position of transmitting rotary motion to one of said spindles, and in the other position to engage and transmit motion to the other spindle.

14. In combination a base, a groove formed in the base, a resistance element mounted in said groove, a contact finger for engaging said resistance element, an auxiliary resistance element mounted on the peripheral surface of said base portion in' which said groove is formed,and a second contact finger for cooperating with said auxiliary element.

Signed at New York City, in the cdunty of New York and State of New York, this 8th day of December A. D. 1921.

MORRIS KLOSNER. 

